package henu.graduation_design.util;

import java.security.MessageDigest;

public class Encrypt {

	public static String MD5(String str)  
    {  
        MessageDigest md5 = null ;  
        try   
        {  
            md5 = MessageDigest.getInstance("MD5" );  
        }catch (Exception e)  
        {  
            e.printStackTrace();  
            return   "" ;  
        }  
          
        char [] charArray = str.toCharArray();  
        byte [] byteArray =  new   byte [charArray.length];  
          
        for ( int  i =  0 ; i < charArray.length; i++)  
        {  
            byteArray[i] = (byte )charArray[i];  
        }  
        byte [] md5Bytes = md5.digest(byteArray);  
          
        StringBuffer hexValue = new  StringBuffer();  
        for (  int  i =  0 ; i < md5Bytes.length; i++)  
        {  
            int  val = (( int )md5Bytes[i])& 0xff ;  
            if (val <  16 )  
            {  
                hexValue.append("0" );  
            }  
            hexValue.append(Integer.toHexString(val));  
        }  
        return  hexValue.toString();  
    }   
}
